I am currently renting out a SFR and I am using checks as the payment method. With mobile deposit, I find this to be fairly minimal effort on my part. None-the-less, I am looking into using Cozy going forward as I start to acquire more rentals. If you want to shy away from checks, I'd recommend doing a search of the forums for online rent collection as there is a plethora of information out there.
There are a variety of methods like direct deposit, mailing to a P.O. Box, dropping off at your bank, etc. Whatever you choose, I would choose something that doesn't involve personal contact because that's when they are most likely to hit you up with stories about Grandma's heart operation or that someone stole their debit card.