I have the Monitor Audio centre speaker mounted below my 65" Panasonic 902 TV.What would be the ideal distance from the centre speaker for the left and right speakers and should they be angled?
The important dimension is your seating position to the various loudspeakers - Speaker Setup Guide
Experiment with 'toeing in' your LR speakers - if you toe them in they may work well for you sitting alone but not so well if you have three or four folk sitting next to each other on a sofa or in cinema chairs, the folk on the far left and right may lose out.