I would go along with this by saying that the one that people always seem to add to their Short Resting mechanics that to me seems rather unnecessary is something along the lines of "Max 2 per Long Rest".
To me, I just don't really get the need to make this a hard and fast rule. After all... I'm the DM-- unless the party just voluntarily goes out in the world to kick the crap out of every single thing come upon-- I'm the one who will pretty much dictate how many encounters the party will have. If I want the party to have three encounters with a pair of Short Rests between them and then have a Long Rest... then that's what I will put in front of the players. But if the situation of the narrative calls for like six or seven encounters over the course of a day (usually dungeon crawling) and the party is able to squeeze three or four Short Rests in there... why put in a rule that says to them "No! You can't take those! Two only!" What's the point of denying them more Short Rests on occasion?
As the DM I will be able to give every character with all of their various resource recharging mechanics relatively equal time and spotlight just by varying up the different encounters (in size, length, and number). So there's no reason to create or force an arbitrary rule. See what the party might need on any particuar day, and work around it accordingly.