I've also used the 8x10 print drum method (poor man's JOBO) for 5x7 and 8x10 film developing.
I use a roller base or just roll the drum in a tempered bath, e.g. my kitchen sink.
The drum I use has slide-in guards which help keep the film sheets in place - so if buying one, make sure these are included (if required).
Emulsion side faces inward, base side faces outside of drum. Haven't had an issue with chemistry not reaching base side.
Rollei chems are re-branded Fuji and as such have separate bleach / fix steps, whereas the powder kits use a combined blix. I've used both, and prefer the separate steps.
The Fuji 5L C41 kit only seems to be available in Europe (macodirect.de), is slow to arrive and expensive to ship - so the Rollei chemistry is likely your best bet (outside larger quantities form a Kodak or Fuji distributor).