scott's suggestion is good. 3 drivers wired for 8 ohms per driver and then paralleled per channel of the cv5000 net out to 2.67 ohms nominal per channel, which is good.
another route would be if the behringer amps go on sale again to get three of those. in that case, wire each driver in parallel for 2 ohms per driver and hook one driver to each channel of an ep4000. the inuke 3000 may be another option for 2 ohms per channel and they are available with dsp. have to keep an eye on how much power your putting to the drivers with either of these scenarios though.
placement will kind of depend on experimentation. it is pretty tough to predict sound in a room because there are so many intereacting variables.