Is anyone successfully using a double backstay tensioner on a masthead rig? Please indicate the make and model. A pic would also be great!

2011 Beneteau Oceanis 46 for sale in Greece
Is anyone successfully using a double backstay tensioner on a masthead rig? Please indicate the make and model. A pic would also be great!
Answer is, yes, you can have twin cylinders. Or it can be done with one, and a big block