Twin mini magnets offers a very good compromise between size and holding power and are ideal for smaller and normal sized standard double-winged doors.

MAGD03000ALS-HD flat electric magnets are most sutiable for locking two-leaf doors.
With Hall sensor.
Surface mounting version.
With counter plate.

6000N (2 x 3000N) - 612kg (2 x 306kg) holding power.
For double magnets 2 mounting brackets are needed.