Switchvpn has been a good vpn provider for me. They have 24/7 online tech support. I mainly use the vpn tho to watch tv from all over the world. I'm American, but wow, our shows... Switch let me have vpn for 10 dollars a month with a PayPal subscription, that I can cancel at any time. Running openvpn from cli has worked really good on BB3 for me, no drops, lagging etc.
For anonymity, as you know, it depends on the level you need, the job etc. if you are doing work for a company and need 100% grab a toss away laptop, never hit yer wifi or home network, don't log in to any account, browse anything online associated with your information, social media, etc. and don't keep that lappy at your residence. If you are doing well enough, you can simply toss it then after your work is complete. There are many older/used lappys online. However, remember the Alfa card's mac. So, depending on the size of the job, the degree of needed security, safety etc. depends on the risk, job, funding.
I'm a small town computer repair guy, will not ever need that degree of anonymity, heck, i can't remember my own passwords, if i lost my usb sticks, i'd be up a creek
lt