I can really recommend going big, like this: https://www.amazon.co.uk/AUKEY-900x400x4mm-Extended-Water-Resistant-Anti-Fray/dp/B00QN3L4ZI/ref=sr_1_3?
Not sure I see the point in that much coverage. I don't move my mouse over my KB for example.
I've had one for years, just means no matter which weird angle you sit at the mouse always has mat, also I find the small amount of extra padding on my arms and wrists nice
@hippy started
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I can really recommend going big, like this:

https://www.amazon.co.uk/AUKEY-900x400x4mm-Extended-Water-Resistant-Anti-Fray/dp/B00QN3L4ZI/ref=sr_1_3?