MVAR
25.01 (1) In this Part:
"designated inspection facility" means a facility designated by the director as an inspection facility under section 217 of the Act;
https://www.canlii.org/en/#search/jI...%20facility%22
So there. Police cannot "direct which designated inspection facility" that you go to. The term is defined in MVAR. The word "designated" is interpreted as a facility that is designated by the Director to perform inspection as per MVAR.
NOT a particular inspection facility (i.e. dealer) "designated" (defined as in directed) by the police officer
Notwithstanding, if the (same) police officer stopped you again and realised you did not perform the inspection at their choice of shops............THEN they can invoke MVAR 25.08(1) to make you do an inspection again, as long as the police officer has probable and reasonable grounds to do so.