Carpet protector for under a PC Chair

[DXP55]

I am in process of tarting up my PC room and have just ordered a new carpet -So can /has anyone who has one of these protectors recommend any particular one or are they basically the same -I guess you get what you pay for.
Wife says see through plastic - Some come with a lip -is that the bit that goes under table to put your feet on or has the edge got a lip.

 

[DXP55]

I was thinking of something with a bit more quality like made from plastic and see through

My last one was a offcut of the original carpet.