I am well aware of how to avoid it, but does anyone have advice on how to get selected
I've heard they want the most bog standard, boring, ignorant people. You have significant knowledge of the law? Out. You have strong political opinions that you voice? Very likely out. So don't appear terribly informed, don't appear like you're a progressive champion of justice. Act like you're open to being fair to either side but not convinced of anything in particular other than the rightness of the rule of law going in, that you're a blank slate. If it's like a case about a cop shooting someone they'd for example ask your opinion on police and push out anyone who said ACAB or anything even remotely like that. If it's about an oil company they'd ask you about energy and the environment and climate change and push out anyone too strongly negative on the industry. You have to appear to be a void, a robot willing to judge the case totally on the facts they give you and entirely according to the law they present to you. Someone without prior strong opinions.