Jimdo is a great CMS to create easy to use websites for your business.
They offer an internal system to add WhatsApp to your website but it is limited to 1 agent and 1 phone number. You can not have multiple agents or phone numbers.
It is good for a one owner business, but it you want something else, you may try our solution. Also there are no options for design. The only option to configure is the phone number you want to use.