HOB Refugium/sump/overflow what do I need?

[RMS18]

I'm trying to figure out what it is that I'm looking for. I currently do not have a sump, I have a internal canister filter that has some ceramic bio balls and some carbon and a internal skimmer. I do not have the space for a sump under my tank, so I thought about some type of hob unit that I can put my tunze 9001 skimmer in one chamber, gfo and carbon in another and the media balls in another. However here's the issues I do not have much space between the wall and my tank about 5 inches. My reason for this is my new skimmer creates micro bubbles that look like crap in the dt, also it would allow me to run gfo and carbon at the same time as my canister filter can't fit both and lastly I'll be able to add more bio media which can never hurt.

Any suggestions? I did see CPR and Finnex systems but wanted to see if there are any other companies to look into.