A good question. I have always tried to do a abbreviated ME Leg Circuit (2 sets of each exercise) every 2 weeks for maintenance. That or a low level of the Chamonix fit sessions. That being said as my volume has gone up even these abbreviated maintenance workouts are probably harder than they should be.
I don’t have any answers for you, just that I have had to skip the maintenance strength when I have high volume weeks due to fatigue. Be interested in anybody else’s anecdotes or feedback.