Not lowered either, but on the ferry the ramp down is the worst, as you approach the entry to the ferry take it slow and you should be O/K. I have a front airdam, and it will scrape (as I found out) if you make the transition other than dead slow. Same coming off.
Did Eurostar crossing once, with a workmate in his car. On/Off is not a problem, as the transition is pretty level.
A group of us went to Holland in 2015 and none of us had a problem on Stenna We are going to Denmark in May from Harwich and do not expect any problems.
My 30mm dropped NC1 never had a problem with Eurostar, the ramps are really mild.
I did ground it on lots of things, so it was initially a concern. I never took it on ferries but my NC3 has been on several with no issues, that however is not as low as the earlier car.
30 mm is fine, 35 is a bridge too far! Ferry crew were excellent and spotted that I was heading for a problem, held me back then set ramp at a half way up/down angle and walked me off. Went back to just 30 mm after that!
We have travelled many times both on Eurostar and ferries but not with the mx , but 3 trips with my 7 type kit car were no problem on the ferries, crews are generally well clued up and help if there is a problem Go for it !!