I recommend to use quarter-wave coupled lines DC block. With modern PCB manufacturing it is easy to obtain good coupling (thin lines with a very narrow gap). For wider bandwidth H-slot transitions may provide good S21 over few GHz bandwidth, but it requires three layers of copper: layer1-microstrip1, layer2-ground with H-slot,layer3-microstrip2. I would consider connector from your link only for some measurement purposes, mainly to protect expensive equipment input ports.