[hudo]

First thing about most HIFI speakers is that they have to be at least 0.5m from the back wall. Otherwise you lose sound stage depth and get bloated bass. Its such a shame to see people giving 5-10k$ on pair of really good speakers and putting them 20-30cm from the wall (i see that ALL the time on various FB groups). I have mine floorstanders around 1.2m away, where they sound the best. Is always a compromise between room and speakers placement.

[bzzzt]

Depends on the speakers I think. My floor standing speakers have front-firing woofers so putting them close to the wall doesn't matter that much for the sound.