The Vortech is fully adjustable for speed/flow, so I wouldn't say it's overkill, you just need to dial in the flow that you require. If I understand correctly, the new pump (MP20) has the same footprint, i.e. it's physically the same size. Plus it has fewer features. I have my MP40W mounted on the side. I guess it really depends a lot on your rockwork or coral placement as to where the best place to mount it is.