Agree with previous posts, you're in the Meraki green, no worries! Just wanted to add one thought. We have had customers with small stacks of 3 or 4 pieces of equipment like that right on top of one another, but NOT in an air-conditioned or even well ventilated room. For US$8 they purchased a USB flexible fan stick and plugged it into the USB port of the MX64, and coiled/pointed it to pass air between the equipment. Worked great, and the before/after was a difference of over 30 degrees F.