Looks like I need to store my RS2 and 911 Turbo for 2 years while I am working in Dubai.

Anyone out there had any experience of these car storage companies ? What should I look out for ?
Does the RS2 have any particular areas needing special attention. I am planning to have the engine started and warmed up once a month and excercise the clutch, brakes and electrics, should be enough ??
Any advise would be welcome.
Thanks
PAUL