Variable temperature Controller 10 different ceramic heating modules each of 50w, 110V. All 10 modules have the same temperature limit

Variable temperature Controller 10 different ceramic heating modules each of 50w to 100W, 110V. All 10 modules have the same temperature limit to switch off and on.
For example, switch off when the extruder region reaches 200centegrade and switch back on when material flow cools down the region by 10degree C meaning when reached 190degree c. If by chance any particular region's thermistor cycles in quick successions without any delay, the switch on/off range, which was 10degree, needs to set to 20c to that particular region. If possible and available, would like to use waterproof radio thermisters which avoid using long thermistor cables and also, the regions being very hot, sometimes the heat can go upto or above 370 degree c (about 700f). Thatis why my first word of this post is asking for "Variable temp limits digital user input temp limits". Need someone take on this project.

That is a very common type of application and it can be done with off-the-shelf components.

Just a digital temperature controller for each heater that uses a thermocouple sensor; thermocouples are OK to far higher temperatures.

An example on Amazon:

A custom made system would cost vastly more than a set of those or similar type units

You can as mentioned just use 10 controllers, you can use a single multi-channel controller fo 5-10 or even 15 channels or you can go out and buy an ADC designed for TC inputs. I would consider thermocouples at the temperature limits you mention. Just a matter of how you want to go about it and your budget. If you want to data log the channels you can do that also.

Ron