Your combination of hitch height on a Forester towing a Honda CRV will vary model to model.
Until you install the baseplate to the CRV, attach it to the Forester, and then view the towbar for being as close to parallel as possible, it may be difficult for anyone to answer exactly what height drop hitch you’ll need, if any.
Personally, I can tow directly motorhome to toad, or use a 2” drop, and still have my tow bar within spec......which is usually no more than 2” higher or lower to level.
Ken and Terry
2018 Sunseeker 2430S with Trekker cap
and only rarely pushed by our 2017 GMC Terrain toad (4 wheels down)
Former Georgetown 330TS owner for 10 years with more mods than I can count.