[ed_denu]

If you have a 50 amp circuit you could safely draw about 80% of that or 40 amps. (3) 3200 watt elements would draw about 40 amps at 240 volts which should be ok for your 50 amp circuit.

You could use multiple ssr's, or a single 50 or 75 amp ssr. Either would work if wired correctly.

Using multiple ssr's would only reduce the amp draw within the oven element wiring, it would not reduce the current draw on the circuit. Your 50 amp circuit should be using #6 wire, the same as you would need for your service cord to connect the oven to the receptacle.