tub p-trap configuration

Hello, I have a question about a P-Trap for a tub. This picture isn't the greatest, but the P-Trap is higher than the pipe it will be going into. This is also an older picture and pipes have been ran where the pipe leading from out of the P-Trap goes to a combination and drops into the other...

I am installing a whirlpool tub on the 2nd floor of a residential home. Joists are 2x10. Adding 1 and 1/8 inches of subflooring yields a total height from 1st floor ceiling of 10 and 5/8 inches to work with for drainage. As shown in the attached picture, there are joists under the overflow...