The mounting arms are designed for bicycle frames and are not suitable for scooter handlebars or solid e-scooter constructions.
The wheel rails are designed for bicycle tires (typically up to approx. 3" without additional parts), whereas many motorcycle e-scooters have wider tires. Due to the higher center of gravity and the rigid construction, significantly higher forces act on the carrier and the trailer hitch when driving over bumps.
For two 30 kg e-scooters, a motorcycle/scooter rear carrier or a special platform with suitable lashing options would therefore be more sensible.
Unfortunately, I have not yet been able to find a suitable carrier. Our rear carriers are all designed for bicycles. The question therefore remains open - perhaps other users from the community can help and recommend a suitable model.