you can but.....
....but despite what some builders and renderers think or even one manufacturer in particular who is saying you can use the standard monocouche over insulation board, you need to use the polymer modified version - Monorex EHI is the parex version, weber M1 is the weber version, monocouche TXF is Monocouche renders version and enewall have one - apart from that I dont think any other manufacturer have a true light weight polymer mono and really you should not use standard cementious render over insulation as it is too brittle and hard.
you normally have to base first with the polymer adhesive such as maite and mesh coats once dry you spray your modified mono, weber M1 however goes straight over without the use of polymer adhesive (weber lac) first altough its better to use the parex spec IMO - polymer base/mesh scratch followed by the modded mono