I have 2015 media S nav 1500 auto. It has electric folding mirrors but you have to turn a switch to operate them. I believe that there is a cheap modification kit available on eBay to convert them to close when you switch off the engine
A Dynamique doesn't have electric folding mirrors and it was never an option, I should imagine the kit mentioned above is for a car which already has electric folding mirrors and it is just some kind of electronic unlit which then folds them automatically.
If you don't already have electric folding mirrors then that kit will be useless.
I took the option when I ordered my Dynamique Nav of having the Electric folding mirrors albeit has to be done manually and you have to have a Reversing Camera which in the pack but for an extra £250 I thought it was a no brainer
I have a June 2013 Dynamique MediaNav DCI90 that has electric folding mirrors. The mirror adjustment switch turns from its normal "rest" position through 180 degrees to fold the mirrors. No auto fold though. I believe that was reserved for the Dynamique S only at that time.