Transporting an E-bike by car has a variety of considerations. If the bike is being transported inside the car it maybe necessary to remove the wheels. On bikes with hydraulic brake systems, do not touch the brake lever and insert a break pad shim into the caliper to prevent the pads binding together and the breaks needing to be bled. It may also be necessary to turn the handlebars or remove mudguards and other accessories.
If the bike is being carried on an external rack, bear in mind that an e-bike has electric components. High speed wind/rain whilst driving may cause water ingress on bearings and electric components. It is recommended to protect the electrical system from the elements (wind/rain/sun/dust) where possible.