I'm assuming these are stereo amps...Go with one amp on each speaker. You can place the amps as close to the speakers as you want. I ran stereo amps like this on my Magnepan 3.3rs. In the case of the Magnepans (4 ohm impedence) I could not bridge the amps & drive the resulting 2 ohm load. So I went with this "vertical bi-amp" mode. The only reason you would want to run "horizontal bi-amp" mode is if you had 2 different amps - like a tube amp on the tweeters & solid state on the woofers.
You should try to have both of these amps biased by a tech.-it's important in this installation to have them as closely matched as possible.
Daniel
You should try to have both of these amps biased by a tech.-it's important in this installation to have them as closely matched as possible.
Daniel