I'm not sure what you mean by "alone." I think you mean something like, "does lnproxy use 2 proxies automatically like how obscuravpn automatically passes your traffic through 2 vpns." If that is what you mean, no. But there are 2 different proxies running lnproxy's software and you can pick which one you want to use on their website, otherwise it selects onr at random. So nothing stops you from wrapping your invoice twice, once via each proxy. Moreover, anyone who starts running the lnproxy software can do a pull request to get added to their list, and the more people who do so, the better for user privacy.