Enokh wrote:I did some google research and according to most, portals need to be approx. 1028 blocks away from each other on the Overworld in order to prevent them from associating with the same Nether-side portal.
No - if you are within 1028 overworld blocks, then jumping into an overworld portal will, indeed, take you to the same nether-side one. However, if you specifically build your own portal (i.e. bring obsidian and flint and steel) at the correct coordinates, then those two portals (the ones you made) will always link to each other. You cannot, however, guarantee that other people's portals will not lead to yours.
Here's what I mean. Say you construct an overworld portal, 1W, at x = 800, and the server generates you a nether portal, 1N, at x = 110 - not exactly precise, because perhaps the exact location was blocked. If I were to construct a portal, 2W, at x = 1200, then yes, I would be sent to 1N. However, if I were to build a corresponding 2N portal, at x = 150, then I can reliably travel from 2W to 2N and vice-versa. 1W will still link to 1N, and 1N will still link to 1W (1N tries to go to x = 880, and it's closer to 1W than 2W).
If you read about the concept of "zones of exclusions", what they mean is this - the setup above is vulnerable because 1N was generated and not precisely placed. If I were to build a portal, 3W, at overworld x = 920, and place another one, 3N, at nether x = 115, then both will correctly link to each other (if I didn't make the 3N one manually, again, it'll go to 1N). While this works, however, 1N will no longer connect to 1W - it tries going to x = 880, and finds 3W to be closer, to 1N now goes to 3W. 1W, of course, will still go to 1N.
Basically, every time you place a portal, you might be redirecting somebody else's (less-accurate) portal. Most portals on the server are, however, accurate.
I'm quite confident this works, because there are plenty of portals within 1028 blocks of each other, and I just (as in, 5 minutes ago) made my own precision-portal, and things appear to be working as intended.