We've recently installed Monitor Audio C265-IDC speakers and documented the install including what/how we route cables etc.
Check out this video to review how we install cables in an efficient and tidy way.
Note - two speakers took nearly 7 hours in this video due to us taking our time, making no mess and no additional holes that need plastering / decorating.
We charge £400.00 inc VAT for a pair of in-ceiling speakers to be installed using this method. If you are however in the fortunate situation of having no plasterboard up, this price reduces to £200.00 inc VAT per pair.