Can't speak about the Spark set up personally, but...
Blue Ox makes base plates for just about every vehicle that is able to be towed 4 down, and their quality is second to none. You can't go wrong with one of their base plates.
Both Blue Ox and Roadmaster make outstanding tow bar set ups, and either one will give you many miles and years of use, especially as your toad is so light weight.
You can use either of those company's tow bars with the Blue Ox base plates. Roadmaster makes/sells adapters to adapt their tow bars to the Blue Ox plate.
Personally, I have a Blue Ox plate on our Subaru Crosstrek, and tow with a Roadmaster Sterling tobar set up. Going on 8000 miles now with absolutly no problems at all.
I'm sure others will jump in with their opinions, but as long as you buy products from a good, reputible company, you should be trouble free.