So what does the actual PA run?
When I joined my current band we had two passive PA speakers and 2 passive monitors, and a 100w active wedge monitor, all powered by 4 channel PA from thomman. Now we have an active PA, so no passive monitors and the wedge blew up ages ago. Me and the drummer use IEMs, the singer seems perfectly happy as he is out the front, the guitarist complains but doesn't seem to do anything about it, so we seem pretty sorted.
If your PA is active, wouldn't it just make sense to get 2 active monitors, and if your PA is passive speakers, can't you just have a 4 channel amp instead and run some passive monitors? I am not sure I see why you would pick passive monitors and buy an amp rather than active ones unless you already had passive PA speakers