I still use an S&S Steel pad - like this:
www.techpowerup.com
Which I received free with a mouse from OC - must be around 20 years ago.
It is large, it has nearly no depth so you can overlap it with your keyboard without it causing any issues, and the surface seems to work very well.
On the odd occasion I've looked for something newer with the same advantages, but never quite found anything.
SteelPad S&S (New Improved Surface) Review
Based on the award-winning SteelPad S&S, SteelSeries has created a new mouse pad that comes with a completely new surface that is optimized to give the best compromise between low friction and best precision. We tested this $35 mousepad that comes with included Teflon and a carrying bag to see...
Which I received free with a mouse from OC - must be around 20 years ago.
It is large, it has nearly no depth so you can overlap it with your keyboard without it causing any issues, and the surface seems to work very well.
On the odd occasion I've looked for something newer with the same advantages, but never quite found anything.