I think when we consider when to c/r the river AI it's important to also consider reasons why people will check back the turn IP and bet the river when checked to. There are basically 2 reasons I would bet/check/bet. The first one is for pot control

say I raise QT and a blind calls, flop is dry Q high, I cbet and get called, check the turn back and bet the river. This hand is where you want to c/r me all in.

second is when I raise in LP, flop a draw IP, cbet flop, get called, check back the turn and hit my draw on the river. This is where you don't want to c/r me all in.