>>I see many that have 5 x 5 top plates. To me that is too small since it will only cover about 1/3 of the speaker's foot print.

Some stands are meant to be screwed to the bottom of the speakers. If you don't want to do that, screw a larger piece of wood onto the 5x5 plate and sit your speaker on that. Just don't let the larger piece of wood extend past the front of your speaker.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8