I thought people bought 60% boards to save space? If you have a 60%, what's the point of buying a number pad? Why not buy a 101 or 104-key keyboard?
Just use a 104 keyboard.
Simple, I don't want a 104 keyboard because I like having my mouse closer to the keyboard (closer as in WASD and mouse are closer together).
I'm a gamer, and on top of that, I already own these 2 TKL, so I'm not shopping around for a new keyboard
Will be putting the numpad on the left of the keyboard, to use with the left hand. It's the conclusion I've come to as the best setup for my needs.
Also by separating numpad and keyboard, you have a more portable setup, as you can just pack the TKL, and leave the numpad behind, something you can't do with the 104.
I've looked around and I'm trying to find a decent Numpad with red switches, or something similar, but unfortunately there is Leopold which outputs wrong numpad codes, and the Keycool one that looks to have slightly poorer build quality, not sure if any numpads come with plate-mount switches.