Is it ethical to hire a rover sitter to do a drop-in visit with my day-care and boarding dogs if I have to be out a few hours?

I do daycare and boarding in my own home and I'm quite busy with clients. However, sometimes I have to go out for a few hours and I don't want to leave the dogs alone, especially when I have puppies. Is it ethical or possible to hire another rover sitter to come in for a drop-in visit or for a few hours while I'm gone? Is anyone interested in this? I live in San Francisco.