Mine sit in an unused space under the basement stairs. Stairs are in the middle of the wall so cool(er) air is drawn in from one side of the basement comes out hotter the other side. In the process of circulating back to the intake side a lot wafts up the stairs helping with heating rooms near the stairs.
I will add that I have an unfinished basement so upstairs floor is exposed and that no doubt helps (in winter). If the basement ceiling is closed off - try and route the hot air through it along some joists?
Beyond that, one of the basement miners is a gimpy near silent R4 so when cold weather really get here it gets moved up into the living room. Only 1 board works but is a perfect 4.7THs @ 490w space heater