Plant suggestions to soften trampoline

in Plants
Hi All,
So far back left of my garden, I'm in the process of sinking the trampoline so it's level(ish) with the lawn. Back will be flush, front will be slightly raised due to the slope of the garden.
There is a small area all around the trampoline that I'd like to fill to soften/screen the trampoline further. The netting will remain.
I've added a pic, please excuse the state of the garden and pretend the upside down paddling pool isn't there! To the right of the trampoline, on neighbours side is lots of Lilac, behind the trampoline is a huge Euonymus, to the left (where I've drawn the red line) is a small Oak tree on our side. I'm looking to fill the yellow marked areas.
Garden faces north east, so that corner gets direct sun from around 11am until about 3pm (maybe a little more) as the sun moves around, otherwise it's pretty shady. Topsoil is thin and under that it's chalky, and quite dry with the tree and the Euonymus. Don't want anything sharp or too delicate for obvious reasons.
Rest of the garden will eventually by a mix of coastal/tropical and some more native plants.
Open to any suggestions for plants to go around here.
Thanks in advance
So far back left of my garden, I'm in the process of sinking the trampoline so it's level(ish) with the lawn. Back will be flush, front will be slightly raised due to the slope of the garden.
There is a small area all around the trampoline that I'd like to fill to soften/screen the trampoline further. The netting will remain.
I've added a pic, please excuse the state of the garden and pretend the upside down paddling pool isn't there! To the right of the trampoline, on neighbours side is lots of Lilac, behind the trampoline is a huge Euonymus, to the left (where I've drawn the red line) is a small Oak tree on our side. I'm looking to fill the yellow marked areas.
Garden faces north east, so that corner gets direct sun from around 11am until about 3pm (maybe a little more) as the sun moves around, otherwise it's pretty shady. Topsoil is thin and under that it's chalky, and quite dry with the tree and the Euonymus. Don't want anything sharp or too delicate for obvious reasons.
Rest of the garden will eventually by a mix of coastal/tropical and some more native plants.
Open to any suggestions for plants to go around here.
Thanks in advance

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https://www.vanmeuwen.com/p/calamagrostis-x-acutiflora-karl-foerster/V59564VM
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I did think about some sort of Bamboo, we have some to go in along the fence in places, on the other side of the garden. The only things that was making me think not, is the amount it drops and the mess underneath. Especially with chippings under the swings so close, and I wondered if it might be a bit hard/sharp (especially if there's some broken canes) so close to where the kids will be playing, jumping, etc. Wouldn't want anyone getting impaled!
I guess a tall grass would work though, bit of a softer landing zone if there are any accidents, assuming it's not sharp like a pampas grass?
Itll need cutting back in the spring but that’ll give you a chance to clear any detritus (lost socks, younger brothers etc) and it’ll soon grow again ready for the summer bounce-athon 😂
Just a word of warning ... don’t get on the trampoline yourself ... I was perfectly fit and able and only 40 when I was invited to join my small niece on hers ... I didn’t even get to bounce ... the unstable surface made my knees flex too far the wrong way 😱 and my ACLigament snapped. It’s not repairable and has caused me endless trouble ever since 😭
Fine for youngsters ... adults are best off supervising from a comfy sun lounger 😉
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
They remain bolt upright despite strong gusty winds and they don't spread out much so they give a neat 'architectural' look.
I leave them over winter as they still look great in the winter sun and then when I see new growth emerging around March/April I cut everything down to ground level and they repeat the performance.
They're easy to divide too (I just bought 4 originally). Once they're growing well in the spring dig them up, divide them in half using a spade and replant.
No sharp leaves either
Wisdom is not putting it in a fruit salad.
The KF looks perfect for the space to the right.
To the left, at the narrowest point it's about 15" of soil between the sleeper and the trampoline. In terms of 'air space' above ground, because the netting and swings are set back a bit, it's probably closer to 3.5' width between the two.
Towards the back on the left, there isn't a huge amount of height due to the Oak Tree, but my concern is that the triangle of space around the tree is very shallow and full of roots.
I'm not precious about the plants too much, I understand that because of where they are they will take a beating!