Here are the dimensions and ohms for the Ember Radiant panels. According to the manufacturer, the cord can be stored at the backside of the panel without a problem.
WHITE MIRROR 60/120. Shipping dimensions 51x27x3 on a pallet 62x32x4.5. Weight 41.20 lbs, ship via UPS Freight on a pallet. Average ohms: 18
MIRROR 600 60-90 Box dimensions 40x27x3. Additional box needed for shipping 46x34x10. Weight 30.90 lbs, shipped via UPS Ground. Average ohms: 23
BLACK MIRROR 60/90 Box dimensions 40x27x3. Additional box needed for shipping 46x34x10. Weight 30.90 lbs, Shipped via UPS ground. Average ohms: 23
WHITE GLASS 60/90 Box dimensions 40x24x3. Additional box needed for shipping 46x34x10. Weight 31.25 lbs, Shipped via UPS Ground. Average ohms: 23
BLACK GLASS 800 Box dimensions 51x27x3 Shipped on a pallet 62x32x4.5 Weight 41.2 lbs, Shipped via UPS Freight on pallet. Average ohms: 18
The line cord is approximately 9.5 feet long.
The temperature of Ember units should be around 212F (100C). The maximum temperature is 257F (125C), and is regulated via 4 thermal switches built in the panel (will switch off at 257F (125C) - lower temperature to around 185F (85C) and then switch on again).
All Listing and certificates of conformity (EMF/EMC, etc.) can be found here: https://www.certipedia.com/search?q=infrapower
Certificates are attached below