looper/router box for effect pedals.
You can have either 2 loops with a master bypass switch+loop selector switch or single loop with the master bypass switch.
a/b box is similar concept to a looper/router box but minus the loops
a/b box is such that guitar signal go into it and allow users to select either output path A or output path B
Looper/router box, instead of single direction path, you have a loop, whereby users can put in any effect pedal in this loop. When in bypass mode, geetar singal will goes from input to output directly. When looper/router box is activated, geetar signal will go into the loop, process by the effect pedal in the loop and output towards the next connnecting pedal/amp etc.
Thus for your need, you can have 2 pedals in a single looper/router box, both pedal will be "on" all the time in the loop. When you need to on/off both pedal at same time, you wont have to physically step on the 2 effect pedals switches. Instead you just need to activate one stomp switch for the looper/router pedal, aka the master bypass/loop enable switch, inorder to achieve what you want.