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Placement is part of the styling, not an afterthought. A favour usually sits on the side plate, on the napkin, or just above the setting alongside the place card. Keep it consistent down the whole table, because an even line reads as considered while a scattered one looks rushed. If the box carries a printed name or date, angle it so guests see it as they sit.
Think about what the thank you is actually for. A colleague who covered for you, a neighbour who took a delivery, a friend who helped you move: these are favours returned, and the correct scale is warm but light. A mid-size box says thank you clearly without making the other person feel they now owe you something back. It is the everyday workhorse of considered gifting.
Gifts for men run into the same tired shortlist every year, and flowers rarely make it onto it. Chocolate does a better job than its reputation suggests, provided you pick the format with the recipient in mind. For most men and most occasions, a large mixed collection is the sensible answer.
Explore this further at Lily O'Brien's Ireland.
One honest note. If the couple ask about ingredients or dietary suitability, point them to the published product information rather than answering yourself.
Then there are the larger thank yous, a promotion helped along by a mentor, or a significant favour, where a fuller collection is appropriate. Match the size of the gift to the size of the gesture and you rarely misjudge it.