I don't know what to buy?

Could you please tell me exactly what I need to buy to Monitor the USAGE Separately of a 50AMP breaker and 2- 30AMP breakers. This is to separately monitor the usage of 3 RV’s: 1- 50AMP and 2- 30AMP’s. Thanks

1x 100A CT
2x 50A CTs

Multiply by 2 if these are dual pole (240V), one for each wire.