I have a Slickwraps back and side and back only for my iPhone X. At work I have an Apple silicone case on for extra protection. Will the back and side still work ok with this on and not damage the slickwrap sides? Or can you only use the back piece if using a case? Just if only the back on it'll never be seen until no case and then won't look as good, I don't think, with just that on. For ref the pics below show the 2 seperate pieces, back+sides and back only. I have a different colour then black btw as my iPhone X is black!