This was from a post by @Tntnnbltn and gives a really good idea of the type of marks that can past muster. But as you can see these are not state survey marks
There are some survey markers (or similar features) which are significant and do have individual eligibility.
Title: Point Zero
Description: Point Zero was adopted in 1925 as the origin of all WA road measurements.
Location: -31.955898,115.860553
Title: Bunbury Townsite Peg No 1
Description: This is the original site of Survey Peg No 1 for the Bunbury Townsite, placed by surveyor H. M. Ommaney in 1841. The site was commemorated with a plaque in 1988 as part of the Bicentennial celebrations.
Location: -33.327202,115.647818
Title: Cameron Corner
Description: The marker placed at the point where the borders of the three states of NSW, OLD, and SA meet. During summer, walking around the maker results in passing through three different timezones.
Location: -28.999095,140.999251
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And this is from the Criteria @elijustrying posted… And is a classic example of the style of mark (this style has a few variations so no one go pedant on me) that @thezonetop50 is talking about.