This is my first build starting to regret it

This is my first build , I thought it would be easy but it is harder than it looks . I was going to install this on top of the case , but it won’t fit with the ram being there and I can’t see any screw holes. I was thinking about putting it on the front of the case , but I don’t know how to place it correctly. I only need the fan placement , and I should be fine after that. Any suggestions are greatly appreciated.