Hi Trenchdigger,
Yes the Two Nix U-Bet would be ideal for what you want to do.

Today I entered the Better ratings top pick and it's price into each race at all three gallop meetings. And told the program to back the Better Ratings selection if any of the 3 totes had a better price at race time. And it worked like a dream.
I personally do not have accounts at all 3 totes, so I cannot use the best tote feature in my version, but it certainly will place the bet at the best tote at race time or any time you specify. I assume you do have accounts at all 3 totes?.
Regards, Robert