trouble with signing order/assigning boxes

We are trying to see if this program will work for us.

I need to send documents to clients for real estate - if they are married both people need to sign, if it is a single person, only one person signs. After that I need to sign. I'm trying to set up the forms so i can fill them in using Adobe Acrobat and then send (either through acrobat or adobe sign).  The problem I'm having is if there is only one signer, it tries to make me the second client. In acrobat, I tried marking my signature boxes as sender with my email address, and putting the test email address as signer 1, but it didn't send to me.

The only option I see is to either:
a) set it up for 2 clients to sign and then for me to sign, and have to change the fields if we only have one client.b) set it up for 1 client and have to add fields if they have a spouse.

I feel like there should be an option to have fields assigned to the sender in such a way that no matter how many clients/signers there are, the sender signs those fields last.