I use an Ikea Trivet from Amazon: http://www.amazon.com/IKEA-LAMPLIG-Trivet-Stainless-Steel/dp/9178898773/ref=sr_1_2?ie=UTF8&qid=1406388314&sr=8-2&keywords=trivet+ikea
My Mac Mini, without the bottom cover, seats on top of the Trivet. SSD's temp dropped from 125/130f down to 105/110f.