Uganda visa on arrival at land border

I can't seem to find any information in regards to visas issued on arrival at land border crossings,
from Rwanda into Uganda.
Has anyone done this recently and know if you can get a visa at the border between Kinigi and Kabale
or Queen Elizabeth NP, or in that region, as I can't work out exactly where the border is from the maps.
I would assume you can't as it wouldn't be as organized as the crossing between say Kenya and Tanzania, but want to check just in case?
Thank you!!