If you hire someone to take care of it, then you can definitely charge them but here it is you who is working. This is an issue which only an expert can answer.
Rent Manager Online

This is a good way to go. If you are new to the investing business then you should consult any property management professional first. This is big amount of money and you should cover all the risk factors first.
Pay your rent online

7% is okay I guess. Even they are making efforts to keep the property in best situation.
Pay Rent Online