I don't have a sqirrel problem, thankfully, but I do plant bulbs in pots, mostly Tulips and usually no more than 2 nice contrasting colours, lots of them, and as deep as you would in the garden.I got the idea from watching Carol Klein do it in her garden. The more pots you can do the better, but I don't go for lots of varieties as the mass of one or two colours, all out at the same time is stunning. This year i am growing Abbu Hassan...one I have always looked for and found at Malvern last Autumn Show. I can't wait.
I am afraid that I don't find the second year worth bothering with and if I do try to get them to reflower I have no great expectations. It is partly down to my lack of skill and partly down to the habit of tulips. I prefer to start afresh each year and enjoy the excitement of finding a new variety or two to try.