If standmounts were an option I would go with the Monolith THX 365T which are on offer right now at £322 each get 3 for your front LCR for less than £1k. You can lay the centre down horizontal if you want to and although they have Atmos upfiring drivers in them you don't have to use them if you don't want to.
The THX speaker series has been engineered to deliver the highest level of accuracy to reproduce all the dynamics and detail of the best home theater soundtracks and music. Each speaker has been THX certified, ensuring optimal frequency response, dispersion, and low distortion. THX certification...