This can be a draft resolution. As at all times choice solutions are welcome.
River is promoting the strategy to open Lightning channels with them however recommends contacting them by means of e-mail sooner than doing this.
Breez has documentation on how to try this and has set a minimal 10 million satoshis (~$2,700) capability. (I requested at the Breez Telegram why this minimal capability was once set and smaller channel opens have been it appears inflicting routing disasters. This turns out like an issue with provide day trail discovering algorithms as further channels/routes are additive through definition and should not build up routing disasters.)
Additionally any exchanges or wallets be offering the strategy to open signet channels with them on the time of writing?
I am not acutely aware of any. See this publish for steering on putting in a routing node on signet.