Evidently, Roku doesn't provide customer service where I could speak with anyone and I can't find the information on their website but would like to know if any of the Roku's provide an RF remote so there doesn't need to be line of sight?
Not really because a roku can come with an IR remote but still can be paired to wifi remote if bought separately.
So the roku WITH RF remote include Express Plus 2019, Premiere Plus 3921, Roku Stick plus 3810, Roku Stick plus 3811, Ultra LT, Ultra 4670, and Roku branded Soundbar 9101 R/X
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Any of the two Voice remotes use wifi-direct a form of RF. And for older Roku 3 there is also the Gaming remote that is RF too.
I'm guessing you're looking for buying guidance to help you choose a model that is supplied with an RF remote.
Roku model comparison page: https://www.roku.com/products/compareAny model listed as having a "Simple remote" is IR only. All of the Voice remotes connect via wifi-direct RF.
I can't find in the product comparison anything about RF remotes. Do I assume that if they are voice capable, then they will be RF?