The protection of physical property will always be an issue, no matter where you are. Either you rely on the government to provide 'protection' (which can also include coercion), or you provide it yourself.
The advantage of seasteading is that, by virtue of existing international treaties, you can be or organize your own protective defensive force, if you are in international waters.
Check out The Seasteading Institute.
Here is their FAQ page.
I recall a few years ago a couple built a home on international waters, near Thailand, and was simply taken out by the Thai government. Without nominal security, or any organization to avail them, that's the last time I heard of them.
Liberland may have some relationships solitary households do not that can avail folks some security from violence, by gangs of thugs from any source. Some security obviously is necessary, because it is all too obvious predatory entities exist.
I haven't spoken with Vít Jedlička since 2018, so I'm not sure about the current status of Liberland.
As of 2018, Croatian forces were routinely and forcibly evicting or detaining any Liberland citizens trying to visit their 'homeland'.
The information I was availed most recently was of the opening of Liberland offices in Mexico after Anarchapulco, from Jeff Berwick's vlog. More than that I do not know.
Yes, I agree, but I was speaking from a best place to begin perspective, and I think sea steading in international waters would require too much priority on security for a fledgling project like this, whereas hiding it in plain site, so to speak, might offer early advantages due to having the structure already in place. Ultimately I agree, sea steading would be a viable option. I just think a transplant to it might be favorable to starting from scratch. These are only preliminary thoughts, though. I may come to see things differently with more discussion and new info to consider.