We want to modernize our current bathroom and I thought it would be nice to have the taps in the middle of the bath so it doesn't cut into your back (with two people) but we also need a shower overhead in the bath; so if the drainage is under the bath taps (in the middle of the bath) is that as effective for shower water drainage? Our drainage at the moment isn't very good so we'd need to get that sorted, prob need new drainage pipes but obviously don't want to opt for something that would make it worse... .