Yes, easy to cut with a small angle grinder or a bit more work using a hack saw. They do expand a bit so you need to leave a bit of space for that.
I use mine in the Ziggy but they don't need to cover the whole area. I find 2 plates enough out of my set of three. The sizes are on the website so just get a couple which will do the job and maybe cut the ends off. No need to have them rounded etc.
Here's a couple of examples on my Ziggy.
and using the flat side