You need 1 motor 1 only as it only works on the passenger door. Yes if you get highline gen3 modules you can recode them for fold on remote.
You'll only need the motor for one side, as only the passenger side is dipped. The part numbers for the motor are different on LHD and RHD because it's the respective passenger side on both cars
As for the mirrors folding, that is separate and unfortunately there is no simple way to get them folding when locked
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That makes sense, didn't thought of that.
Just spoke to Troubs12 as he told me folding mirrors need a folding motor in their base, so I'll stick with this mirrordip mod for now.
I know about the folding, @Troubs12 did this mod on his A3 8P1
Mirror adjustment motor: 8T0959578A (1x)
Module (with motor): 8P0959802J, M or P (2x) (two because of the folding mirror mod doing later on)
Terminals for the wires: 000979009E (or the connector @Troubs12 linked above me )
That's all? seems like a very reasonable mod that will be used everyday.