Those fancy pre-built attenuators are all expensive. There is no way anyone can say "Yes, this one will work. Buy it, and sod the others."
OK, so what to do?
Well, resistors are cheap. Leaded or SMT, they are cheap.Try making some and then decide which ones to use! It is not that hard to make. You can Google any number of sites, and find the formula(s) for making them.
Ok, some of you may not have the skills to make one. Hey, they are extremely simple to make, and as good a starting place as any to learn to solder. Yes, they will not work as good as the $15 ones.
They will get you 95% of the way there. Even if they are space-wired. As long as the leads are not an inch long, they will get you most of the way there.
Now.........since I do not own one of these doo-hickey gizmo things..........
It seems the output level is too high. So, where to put the pad? For reasons that might be hard to 'splain, I would start on the TX end.
There is no reason to not put some of it on the RX end. In fact, there may be a good reason to put some on the RX end.
The only way to know is to try. Every system is going to be different. There is no single correct answer. You will all have to experiment, and decide what works best in your system.
(I think that also counts as making a positive contribution.)