according to the info below it would be best to take probiotics after a high protein meal because it raises the pH:
The pH of the stomach may go as low as 1.0. This is a very acidic level.
Because the pH scale is a logarithmic scale, the pH of the stomach is
hundreds or thousands or millions of times stronger than typical cellular
fluids which are generally close to 7.0 (the neutral level on the pH
scale.) When food comes into the stomach, the pH may rise to levels in the
3.0 to 4.0 level due to the buffering capacity of proteins.