Putting in a bathroom floor drain.

[Garen T.]

I'm getting ready to submit permits for another duplex. Both sides will be for rental. Based on past experience, this time I had added to the plans for bathroom floor drains to be put right behind the toilet. I always put in tile floor, but this would 100% eliminate any toilet or tub overflow concerns. 

I already have a drain pan put under the washer, but this added security seems worth it. Has anyone else ever done this, and is there a downside?

Thanks