I do this. I had hair transplants throughout the 90s and finally gave up and started wearing about a year ago. I shave the transplants except for the hairline and wear a topper behind it. I have to believe it is definitely lower maintenance because after about a week, when the hairline starts to raise up due to hair growing underneath it, I can still get a couple of days in before I have to reattach because my "real" hair hides the lace. The downside is that fitting your unit into the bald area is tough. Your template has to be perfect because you have to fit the unit into a closed oval rather than an open ended U shape. There's less room for error in attaching. I've had to do several reattachments because I accidentally overlap the unit onto my hairline by just a millimeter and the lace starts to detach within a day.

Still, I'm very glad I don't have to worry about the lace showing at the hairline.