So online Ryan Kennedy asked where a possible preview center could go. I said it's most likely to go online, that has an infinite and immediate reach.
But if it's physical I have three suggestions, one as a total joke but it does make sense!
1) CityWalk - Seen by all guests who visit the resort a temporary exhibit could be set up in a new structure or replace a tenant till a new one comes in.
2) MCO - IoA and USF each receive over 10 million guests a year, but MCO saw 47.6 million in 2018. It would be accessible for free to locals and would be seen by those touring other Orlando locations, business travelers, those visiting family, and those visiting Universal. Plus add some cool features (maybe a portable Olivanders?) and you have a sweet set up for two years or so.
3) Disney Springs - Hey they're looking for new tenants and that's a market untapped yet by Universal! Plus there's a certain amount of smugness about it that's sort of Universal.