You'll save yourself a headache by just doing point buy or stat array. Rolling turns grown adults into whiney children. Everyone loves the idea of rolling for stats, but no one wants to abide by low rolls. And when you let the low roller reroll, the average roller will want to reroll because they could do better, but they don't so now they just want to keep the first set. Now everyone rerolling a third time without asking and you tell them to stop, but now they don't remember which numbers came from which roll, so they're just going to keep the better ones.

OR you say no rerolls under any circumstances, but now you have to hear them complain about it through the rest of the game while they argue that their character should retire and they should be able to retire and reroll as many characters as they want until they get an 18, a 16, and no other stat less than 10.