Hi flashtro, Ian commented about the FMS stands earlier in this thread (page 4 in my browser):
Originally Posted By Ian
I will answer a bunch of questions here. Hopefully I didn't miss any.

The M5 does fit on the FMS stand but we did modify the top plate to make it more centred on the stand. I would suggest getting new top plates for you stands. The will cost $39 each.

The sensitivity delta is not that great between the QS10 and QS8. We have changed the spec on the QS8 as it was out by 2dB. I am also going to try to get the sensitivity of the QS10 up a dB or two before we start shipping. So it will end up between 2 and 4 dB less efficient. Going after bass generally reduces the sensitivity.

The wall mount bracket for the QS10 is the same Power Bracket as the QS8. Just lift off the QS8 and put on the QS10.

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Cheers,

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1