While it is important to have an echo in each room for controlling lights, I have far to many. But why not, I'll play along.
7 dots, gen 3
1 dot, gen 2
3 echos, gen 2
2 echo plus, gen 2
1 echo, gen 3
2 show 5
1 show 8
2 echo studios
2 echo subs
3 echo autos
1 echo link
1 echo flex
2 fire tablets
1 firestick 4k
4 fire edition tv's
And the app on my phone
So, 32? Ouch, at least they are not all active. Let's Not count wifi devices, that is out of control at my house.