Check the dimensions on this, it is not a HOB but has a very small foot print.
Reef Octopus Classic 110 Space Saver Protein Skimmer NWB110SSS
Body Size: 5″ Footprint: 6.1″ x 7.87″ Neck Size: ″ Total Height: 19″
I have had one on my 65 since Dec. of last year and it is working very good. I too had a very limited space to put a skimmer.