So basically if the wife could **** standing up, a urinal would have
been more appropriate?

Quite possibly. I would probably trust it with the squits as well, where you
may need to occupy the toilet for some time, but aren't particularly
challenging it.

Also how do you send the sanisplit back for exchange?

Do they come to collect or does it go through the post?

They collect. Presumably using a very understanding courier. If you are near
their depot, you get a discount for collecting yourself.

Christian.