Way to raise PC+gaming chair?

[PC Pilot Dave 3]

Hi all,

A bit of a random question (and I apologize if I did not select the appropriate forum for this), but I thought someone might know of a product I'm trying to find...

My wife and I are working towards closing on our first home. This house has a finished basement (sweet!) with a sump pump. Based on the recent inspection we had done, it doesn't look like they've had any issues with flooding in the last 6 years and we are not in a flood zone, but I'm still concerned about the potential for water entering the basement. Parts of the town we live in can sometimes have problems with drainage when it rains very heavily.

So basically, I'm looking to see if there's a raised platform or water resistant mat or something similar I could put my Volair Sim gaming chair and full tower gaming PC on just to take extra precautions. I've been looking around online a bit and haven't been able to find quite what I'm looking for. The entire gaming chair/PC setup is probably 60 inches/68 inches. 

If anyone has any recommendations on what I'm trying to find I'd be most appreciative!