Consider leaving in the outboard well , stowed transversely in the retracted position , secured with a ‘Motorloc’ Atlantic Slot Lock 170 , with suitable padding like Force4 flat fenders above and below , suitably lashed down.
There has been previous debate whether outboard needs to be removed, kept upright or can be tilted for towing. Yamaha 6HP can be upright, tilted on either side or face down, without risk of oil leak, according to manual.
Kind regards, Andrew