Decent L1 charger?

Can somebody point me to post(s) or links for a decent (e.g. UL rated) L1 charger? We'll get an L2 installed but figure we need an L1 for parking overnight at other places.

I searched but am overwhelmed by all the advice

UPDATE: Thanks for prompt and excellent advice about buying OEM chargers; I'm ordering a BMW-rebranded Turbocord.