Developing by hand does not necessarily mean inversion, tanks can be rotated on any flat surface, or in place on the inexpensive Jobo roller base #1509 if one need to or wants to save space.
Sadly, this doesn't work for me at all, I don't want to roll my tank, because I don't develop that way, especially in black and white, I only do a tiny tiny very gentle inversion once per minute, and it sits the rest of the time. I use Rodinal mostly and technique changed results significantly with this developer.
~Stone | "...of course, that's just my opinion. I could be wrong."~Dennis Miller