There are horizontal rotary encoders with click functionality (The component is called EVQWGD001). Unfortunately the pin layout differs from the vertical rotary

There are horizontal rotary encoders with click functionality (The component is called EVQWGD001). Unfortunately the pin layout differs from the vertical rotary encoders so you need a custom PCB or hack some custom wiring together. They're more common on split keyboards from what I've found. You can buy a preassembled split keyboard with this from https://ergomech.store https://ergomech.store (I've been looking at purchasing one from them). There's also a seller on etsy who offers split keyboards with the horizontal encoder.