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exactly like this, waste under the bath fillers. partner raised the same question with the double headed bath about standing on the slope, but it hasn't practically been an issue so far (although the shower end head of the bath does need more attention on cleaning, as London = hard water, and it gets more standing water I guess.) I like it way more as I'm not standing on the plug when I shower, water is flows away from not towards me etc.
I don't bath a lot but it makes it far more comfy definitely!
We just switched from shower end to middle - no difference whatsoever, but also replumbed the waste so could have compensated...