Nick,
If you want to put a Ronco tank in that port area, I'd recommend carefully measuring the area to determine the maximum size tank that you want. Then go to Ronco's online catalog and copy / paste it into a spreadsheet then filter on the 3 dimensions you want to find the tank closest to the dimensions you want.
https://www.plasticwatertanks.com/c/cf7 ... ks-catalogI went with the V-tank solution about 4 years ago and it worked great. Added the SCAD tank level sensor next to the medicine cabinet and used Poly X hose and bent Sch 40 PVC for the horizontal runs to ensure no odor permeation. This installation replaced one on the port side.
Good luck with the project.