Remote manage mikrotik through L2TP

Hello,
New to mikrotik world here!

I give to some of my customers preconfigured Mikrotik APs and i like to know, how can i remote manage it.
I tried to setup L2TP server to my end and l2tp client to the APs but i have issues (no internet on customers side, or internet through my internet connection)

I want the L2tp client just to know the customer’s ip and make possible that i can connect to the box, the customers should user their internet like mikrotik wasn’t there!


Thank you !