that amp would work, although the speakers would be slightly underpowered and you would have an extra channel. it would be a simpler if you went with 2 or 4 of them. and then find an amp going by the rms power of the speakers and amps. the speakers you showed have 250 w rms so you would need 750 rms for 3 of them or 500 rms for 2
just a suggestion if you want really good midbass check out the selenium woofers.