Complete beginner

Hello all, as the title says complete beginner here. I’m looking for something to stimulate the prostate primarily during partnered intercourse with my wife. Having never experimented with anything more than a finger in and around the anus should I look into an Aneros trident, peridise, or a small plug (b-vibe, or Maude cone)? I’m concerned a trident or other aneros products would hinder positions and mobility during intercourse. Thanks in advance.