Doing wife with strapon

I'm considering getting a strap on dildo, such as a Doc Johnmister, in order to introduce my wife to the experience of getting fucked by a larger unit. I have already tried a girth enhancer that is worn directly on the cock, but it didn't work out. It was just too massive.

Can anyone here share experiences of using a strap on on the wife? Does your own penis get in the way if it is erect?

I am looking for a great strapon for my wife. She has said that she is going to ***** me to where a strapon from now on. We did it once years ago and it was pretty funny because she actually got mad at the dildo for making her cum so hard (she was determined it wouldn't be very good lol). Now she's over that and has come to the conclusion I am not big enough and wants me to use the strap on now.
So I am in the market to find a new dildo for our harness. Any suggestions are welcome!!