You need to go back and read what Mike and Nanook have pointed out. The cables are there to prevent the prop from smacking the ground if there is a failure in the gear suspension. Expanding the argument to include failure of attach points and gear attach fittings is above and beyond what they are designed for. Install the cables as designed. Stop. Install the correct length cables. Stop. They will protect the prop in case of failure of a bungee/hydrosorb assembly or cabane vee. End of argument.
I personally don't believe the center tab attaching 'up' or 'down' makes much difference. But installing the wrong cables will. There is a set for standard gear and extended gear. Installing the wrong ones will allow the prop to contact the ground before tightening up or will restrict the travel of the suspension.
Whether you install them or not is completely up to the owner. Do they cause undue drag? Of course not, when compared to the big tires, gear legs, struts, jury struts, flying wires that fly with you every time. Do they add weight? Some. But if this worries you, leave out a quart of oil from you fly away kit and it cancels out. But when you have a suspension failure and you end up rebuilding an engine and installing a prop, take a look in the mirror and no where else. It's a free country, so far, so make your own decision and take responsibility. And if you make up your mind, say so and don't look to others to validate your decision.
My decision is to install them. I've seen many incidents that were the result of, or resulted in gear failure. The cables will prevent engine and prop damage in some, but not all, of these. If I can bolt on a cable set that will allow me to install a new cabane vee or suspension leg and fly home, I choose to do so. Especially when the decision to NOT install the cables means that the aircraft will most likely come home under a helicopter and require extensive repairs/engine replacement.
Push the odds in your favor, or not. YOU chose.
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