Trial subscriptions are for pay subscriptions where the first month is free for the user and subsequent months get invoiced, if the trial does not get cancelled before the end of the trial month. So, assets bought via the trial subscription are the same as for pay assets (standard licence, enhanced licence, extended licence).
A standard licence allows for any use, where the print run is less than 500k. For some uses there is a view of less then 500k imposed to be inline with the standard licence. If your permanent exposition stays under that 500k limit (most will do), you are fine with a standard licence for both, visuals and sound.
As for the "transfer of ownership", normally, agencies do transfer a licence to the finished product, that fits the intended use, and not to the assets that are used in the finished product. You can do your own licensing terms, as long as those are inline with the Adobe terms (as an example: you could time limit your work, even that the Adobe licence grants a perpetual use of the asset, but you cannot grant a licence for 1,000k views, if the Adobe limit is 500k views).
If you want to transfer the licence of the source assets to your final customer, you may do so as pointed out in the licensing terms. Your customer needs to agree to the Adobe terms, or to your own terms, that are at least as stringent as the Adobe terms. There is no transfer of ownership with stock assets. You only acquire a licence to use the assets.
Quotation is up to you. Adobe does not hinder you to ask any price for the assets, as long as you respect the licence terms. Please note that your costs are higher then the actual fees you pay to Adobe, as you need to include the costs of asset research. Some providers do that as a separate price in their quote, some simply include that in their total quote. Quoting is between your client and you, Adobe has no say into that. You'll know that wil a 10-assets-per-month subscription, your cost per asset will be $3 if you use up all your available assets.
Look here for more information on licensing: https://community.adobe.com/t5/stock/links-for-licensing-terms/td-p/11366788 (Disclaimer: As always with licensing, this is my interpretation of the rules. I think they are correct and advice is based on reading and interpreting the licence terms and on fair use for both the buyer and the artist/stock company, but I cannot rule out that my interpretation is wrong. I'm not an Adobe employee).
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