Async code inside a long running background thread

Arrived to this great repository after watching your great talk on scalability on youtube.

The situation here: https://github.com/davidfowl/AspNetCoreDiagnosticScenarios/blob/master/AsyncGuidance.md#avoid-using-taskrun-for-long-running-work-that-blocks-the-thread is relevant for us (we have ~10 such workers which keep synchronizing some database tables, each worker for a different table, into memory cache so that when http requests come we can handle them quickly using the data from the memory cache instead of querying the database) however we run some async calls which don't have alternative sync calls from that background worker and the example shown is sync so it is unclear how to correctly start async code in that new background thread without going back to using .Wait or .Result?

Maybe in such cases we need to use Task.Factory.StartNew with TaskCreationOptions.LongRunning which allows to smoothly run async task? and if so can you please provide an example of how to correctly do it because I saw that you wrote that its error prone if to pass wrong parameters

Thanks!