This one is the size of a sheet of A4 paper. I bought one last week. Mono FX send, stereo return. I’m using it with a guitar, and an H9. It’s USB so you can also use it as an interface, and use the H9 to add effects to software instruments.
https://www.thomann.de/gb/soundcraft_notepad_12fx.htm
Another option is the Yamaha MG10.
