Some possibilities: Glue a neodymium magnet on the back or a piece of wood you can drill into. Maybe you could buy the mounting bolt from Axiom.

How are the M5HPs compared to the M3s?


v2tov4
A-LFR/1000-8&2,500x2
1000&1500-3
100,160,QS10,800,M2/3/5/50
N2,N3
Audiobytes
A-LFR1500 coming