I’ve ran the Confidence series and Heritage Specials. My HS are in about the same size room as you’re referencing. I use the standard issued Dyn stands for the speakers, along with the HS plate. I recommend you fill whichever stands you go with. I used aquarium rocks, they come in various sizes and is rather inexpensive and not messy.
I use the Dynaudio Sub6 with the HS and it sounds fantastic. The HS are little boomers for their size, but the sub does help at with the low Hz.
I’ve ran various amps, but one thing is consistent, Dyn’s need current. I’ve ran McIntosh, Pass Labs and PS Audio amps in various flavors. I would not run McIntosh with Dyn again, sound fell apart if you got on it. The Confidence series do need room to breath off the wall, considerably. The HS seem to operate great in a traditional space/corner set up; they’re set about 2 feet from side and back.
Room acoustics are key, I’ve used both room treatment, along with a DSP and produced great results. I would get your speaker toe/placement set first, then add treatment(s), then settle if you need something like a Dirac or DEQX Premate.