Introductions discussion

Looking for some advice and details about doing short-term chastity on a fairly standard basis. We haven’t bought our first device yet, but I have my sights set on the Birdlocked line and will definitely pick something from them when payday hits next Monday. Cleansing shouldn’t be a problem since we shower together often; the device can easily come off for a good wash daily or at most every other day. A silicone option appeals to me because my partner is very active, plus he’s super worried about whether people can see it through his clothes in public. I figure that if it fits well, silicone will avoid any movement issues he might have with metal or hard plastic, and likely offer the lowest profile so passersby won’t easily notice it while we’re out. While our time locked could grow over time, right now we are focusing on short terms—specifically one week max. Any tips on sizing, ordering, where to buy, device pros/cons, and general help for someone who has only dreamed of locking a male until now, finally finding a partner willing to hold the key, would be much appreciated. Thanks.