Last winter we fulltimed in CA (above freezing) and I found
Handy heaters the best.
I placed 3 of them around camper and since they run low heat at low fan, they run constantly giving temp with no spikes.
In bathroom I plug it into outlet at 4 ft level, so it was nice and cozy when I was coming from the shower.
The thermostat build on the unit is prone to overreacting, so take some try by error to find proper comfort level, but once you have it set, no more hot spots, low noise and with size of them -no problem about space.