Floorstanding speaker advice needed for long room

I’d appreciate some advice on getting floorstanding speakers that don’t need to be placed too far into a room.

I want to upgrade my bookcase speakers and sub for floorstanding speakers but am worried my room might be too small. It’s 12ft wide, 9ft ceiling and 21ft long (we knocked two rooms into one when we bought the house). Due to furniture layout etc. I have my speakers positioned facing the length of the room. They can be 6ft apart but only about 1/2 to 3/4 of a foot from the wall behind. At some point in the future we’ll move but for now I’d need speakers that sound good close to the wall and this distance apart. They would be driven by a Rega Aura.

I’ve read good things about Spendors and Dynaudio, would either of these be suitable in this kind of space? And if I go for floorspeakers, presumably I can retire the sub (Rel T7).