Nesting Nightjars

I am pretty certain we have a pair of nesting nightjars and a recently hatched brood on our upper terrace which is surprisingly close to the house and our cat penthouse in the garage roof! They are regularly flying in and out of the same place even in the daytime and are a fabulous sight to see and to hear both their nightly chirring and that very distinctive wing clap/flight pattern.
How do they protect their chicks from predators? I’m worried about our cats. Sadly I can’t shoot the cats as OH is very fond of them, can’t put collars with bells on them either as they are semi-feral forest roamers not house cats.
I would love to put a trail camera on the nest but don’t want to disturb them. I don’t suppose there is anything I can do apart from cross my fingers and hope the chicks live to fledge?
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
I wouldn’t have the cats either @Fire (we inherited them with the house) but there are lots of visiting cats during the night too - hours of trailcam footage of the ruddy things and probably our two well-fed ones are the least dangerous to them. It’s fairly wild with dense undergrowth outside our small cultivated patch so OHs fear is they would get caught up and strangle themselves. We did try a quick-release collar on the tamer one once but it was gone within a day.
I was lucky enough to see one about 5 miles from home earlier this week. A male flew right past me just as it was going dark and proceeded to take moths from a perch on a partially-felled tree. In between it churred loudly. I made a recording with my phone but unfortunately this site will not allow me to upload it.
I play with plants and soil and sometimes it's successful
How wonderful. We just upload to Yoube and post the link here. @Vi@VictorMeldrew
I play with plants and soil and sometimes it's successful