I think the bellows you have would work best only on the Z axis and with some sort of retainer on the sides. I have similar on the Z on my Torus, but they do have retaining behind it, so it doesn't act so wild.
I had bellows on my 80/20 for several years. They were better quality and had plastic built inside for support. They eventually wore out though. Mainly due to chip packing in the folds and difficulty removing them. I recently replaced all of them with flexible rubber sheet. It is much nicer and acts very predictably. Has a natural curve over the edges to direct coolant a chips into the pan where the should be.
I really love the sliding metal way covers on the Y axis of the Torus. Now that is the way to make covers. Some designs won't allow that type of thing, but I think I can manage that on the 80/20 the next time I need something new on it.
I notice that your shower liner is a little stiff.
I initially used some plastic runner and it was pretty stiff too. The problem with stiff material and the bellows you have is that when cleaning up, chips will be able to easily migrate underneath. Right where you don't want them.