I have mine placed behind my speakers because I run long interconnect under the floor, keeping things tidy. If the amps were placed between or in front of the speakers the wires would show and present danger due to exposure to foot traffic.
Other than that and wanting my speaker runs to remain as short as possible, the position is not all that critical, especially if good amp stands are used to help isolate the amps from the impact of peak music passages.
Other than that and wanting my speaker runs to remain as short as possible, the position is not all that critical, especially if good amp stands are used to help isolate the amps from the impact of peak music passages.