Review on 🔌 JBtek Acrylic Transparent Base Plate & Terminal Optimizer Breadboard for Arduino UNO R3: Enhancing Arduino Projects with Enhanced Connectivity and Versatility by James Roberts

Look carefully at the pictures. Basically you buy a separately packaged breadboard and a drilled piece of plastic with a few screws, standoffs and nuts. The photos show two different ways to use the racks. I tried it like this, half and half (two screws in one direction and two screws in the other). I found that I couldn't attach the board to the plastic panel with the screws facing down, which I think would be preferable as the standoffs aren't long enough to reach the nuts underneath, so I used the screws facing up , but so, I found there was only enough room for one not on top of the board (Arduino Uno, but that seems sure enough. For the money (cheap) I'm glad I bought this.