Over many years I have mounted amps in all sorts of crazy configurations, None of which resulted in a overheating issue. My last vehicle had an MB Quart 1000watt mono amp mounted upside down on the rear parcel shelf. It got used hard, and never had issues with it. As a matter of fact, after 7 years of use, It has now retired to my amp shelf in the garage, but still works well.
If you are still concerned, you could remove the bottom of chassis, and drill a few holes in it to vent the heat, and mount it with small spacers under the feet so air can move about.
I'm sure you'll be fine, whatever you chose to do.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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