Can easily hold 4 iPads/tablets or several more phones.  It also holds my M2 MacBook nicely.  They're wide enough to accommodate most thick rubbery cases.  The base is 180x180mm, the maximum I could do on a Mini+

I needed a way to store my kids tablets and also parents phones without having them scattered all over the counter plugged in to chargers.  I printed with 15% adaptive cubic infill but the design is pretty solid and you might get away with less.  I added some rubber feet to the bottom to prevent sliding.