I've tried it at home with a G70 and a G75.
They are among the lowest latency units available at 1.5ms each.
Most wireless units have a fair bit more than that, but ultimately most latency is not really any different than standing a couple of metres further from the amp. If there is a modelling unit as well (Helix etc) then the ADA process in those units also increases latency a little.
My main concern is that using 2 units means 2 separate freqs in use and a bigger chance of interference.
Overall though, I didn't see the point. Bass to board - yup. But board to amp as well? It worked with my 2 units but it was more faff, more batteries, more charging, more risk of something going wrong than a simple cable.