I use the extra tall floor stands from STB. Never had a problem with them not being sturdy enough. I think all brackets and placements will be fine.

Or at least don't place them as they did in the Modern Family series 😁

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//EA

Thanks for all the feedback.  They appear to be very reliable, as does all B&O kit, as people tend to look after them very well.  There also appears to be great backup from dealer.  I've returned my trial pair, and currently testing Kef LS50 wireless speakers.   At £2k brand new, they're a much smarter investment, but the sound is possibly too clinical.  The Beoplay had a lovely warmth to them, although do lack some bass at lower volumes.  The installer did mention when taking them away that they would have performed better had I used their internal amps rather than my own external non B&O one.  

Will need to decide soon, as after having heard these now, I realise how bad my old kit is and cant bare to listen to it!

ire74 wrote:

The installer did mention when taking them away that they would have performed better had I used their internal amps rather than my own external non B&O one.

This is a rather peculiar statement. BeoLab 3 is an active speaker – there's absolutely no way to use it without its internal amplifiers, regardless of what you connect them to.