This DVD I’d like to order is given a technical classification of region 0. Amazon details here what regions 1-6 pertain to, but they don’t mention a region 0. The DVD is available only on Amazon’s UK site, but I’m still not sure if this means it will play on an American DVD player or not.
It appears that a region 0 DVD will play on any player.
As far as the region code goes, yes.
If your DVD player does not have a PAL-to-NTSC converter or your TV cannot accept the PAL signal, then the answer is no.