Pressure Zone Microphones are superb and placement of the mike is just not an issue. They are ridiculously cheap and idiot proof. They don't even look like a microphone! A flat piece of plastic about 3.5 ins square. They only work when placed on a flat surface. Fasten a 12" square piece of plywood on a mic stand, fasten the PZM mike to the piece of ply - great for ambient recording and for recording "moving" instruments (Concertinas + Left hand of melodeons) Tandy used to make 2 different models but now they just sell one. Fantastic value for money.