The housed resistors are fixed to surface you wish to heat and thermocouple taped to same surface. I can draw you a wiring diagram if you wish. Note the actual control uses mains electricity so must be boxed.
The 3d printer heatbed have a maximum temp of 100C maybe 120 on 24V. Based on a quick lookup hot embossing machine can go up to 400C but I like the idea of the heatbed. (I’ve got a 200x300 mounted on alu plate if the bed operating temp is suitable thou)
On the other hand you could use Ceramic Cartridge heater for 3d printer but over 280C forget about thermistor and will need to use a thermocouple. A simple arduino and a power relay combined with LCD 2004 should be all you need.
Ok. Google is saying 40-90°C temperature for 2-30 seconds, pressure of about 300 kilos (which I think your press should handle fine). Are you looking at heating both sides of the press or base only?
Perfect! I think a couple of these screwed on the side and you have your press. And then how to attach it to your press needs to be resolved but in terms of heating I think you’re home