Your hides are probably fine, but if you are interested in bowls easier to cut through, I got the bowls for my hides at the Dollar Tree (or 98 cent store, depending on what you have in your state) and they are about the same size as yours, 3 for $1. Because they are so cheap, I could cut through them with scissors, and then just burned the edges smooth with a lighter and cleaned them with bleach and rinsed them good. I plan on just going up a size as my snake grows. I just like having a hole I can peek through so I know where the snake is without disturbing her, since snakes are escape artists, so you want to take a head count as often as possible. haha! I just like being able to check on her without her knowing.
But good set up! You could throw in a few plants in the future to make more of a visual barrier and add security. But those buggers are about $15 a piece. Not necessary, but the snakes seem to like them if they are there. Something to crawl around on is usually good for when they are up and about (usually when you are sleeping.) Paper towel tubes work great!