The solution is on your end, don't put in slices that are too thick.

There's more than one way to toast a slice.

There are toasters with wider slots:

Here's a conveyor toaster:

https://youtu.be/GEOCBukuwK4

Here's another cool, old toaster, you push a lever to flip the bread, toasts one side at a time:

https://youtu.be/ABbmJSfwMoY

This would work over your stove:

A glass sided toaster that splits in half:

https://youtu.be/Fv__lSiMmZA?t=29