Hi Andrew, many thanks for bringing this subject up. This isn't a question but did get me wondering just how poor of a decision I'd made concerning my centre channel position so I did a little experimenting.
Took a laser pointer, protractor, tape measure, checked the angle which the centre was projecting into my room, at what height was it really directed.
Was clear it's present position was pointing at the legs of anyone in the first row, fine if you were sitting in a bean bag on the floor, not so much sitting in the chair. So, I have scrap oak laying around from other projects. Used some to fabricate a stand with some height adjustable speaker stand spikes. Can't say I've noticed a night/day difference with the new stand but voices sound better, clearer is the best word to describe the change. So again, thanks for the idea, looking forward to your Video on the subject.
Young enough not to care