Jenn-Air CVE3400B Cooktop Wiring? I am planning a kitchen remodel for my family. We have inherited...

I am planning a kitchen remodel for my family. We have inherited get-togethers approximately twice a month and the slide-in electric stove (Maytag MER5730AAW) is not enough cooktop space. I acquired two Jenn-Air (Maytag) CVE3400B electric- cooktop-downdrafts that are flawless for the kitchen since we rarely use the oven (maybe once a year). Here are the specs.

Maytag MER5730AAW sticker:
3 wire - 1 phase - 60 Hz AC simply
120/240V 120/208V
10.4Kw 7.8 Kw

Jenn-Air (Maytag) CVE3400B
3 wire - 1 phase - 60 Hz AC only
120/240V 120/208V
7.0Kw 5.3Kw

Questions:
1) Would I know how to use the existing wiring?
2) If yes, Can I split the existing to 2 seperate boxes for each of the cooktops?
I enjoy 1 cold radiator and i own...
Answers:    No. Your supply to the field area is sized for the existing range. Even if you discount the oven, you are unlikely to own sufficient capacity in the breaker or the supply smudge. Run a new, properly sized supply line connected to a brand new breaker for the two new cooktops.
How can i unclog the toilet beside really...
No you cannot use existing wiring, unless you want kitchen fire... LOL. Also, downdrafts are designed for pre-wired circuits. You want an exhaust for any downdraft. If your plans include a TOTAL remodel then, yes, the 2 cook tops will be wired to be sufficient. Make sure you enjoy at least 1 oven to bake contained by, if needed.