Your own account, on the wall
Post once, and it is in two places.
App Store · Instagram
There is an Instagram app in the App Store. That covers the common case — a venue putting its own account on its own wall. It does not make a hashtag wall, and this page will not pretend it does.
Plans, prices and trials are set by your ScreenQube partner.
Where it ends up
The screen above is what you publish. This is where it ends up.

How it is made
Named against the product's own modules rather than invented for a marketing page.
Your own, which is the case it fits.
A column, or the whole screen.
Like any other composition.
Post to Instagram and the wall follows.
What you get
Post once, and it is in two places.
Beside your own media.
New posts arrive on their own.
Publish targets facilities.
It appears with the composition.
Not a replacement for it.
Who runs this
Nearby
Questions
Assume account-level, and ask before promising a hashtag wall.
None we can evidence. That is exactly why a public hashtag on a school or stadium wall is a bad idea until the product team confirms otherwise.
Not in the evidence we have. Instagram is the one confirmed network.