I use chocks on the trailer and they are great, wheel the bike in and you can let go and the bike happily stands there whilst i strap it down. In a garage they would be good. I use these which are not so good for thin skinny wheels,https://www.ebay.co.uk/itm/373776399133?epid=2219529718&hash=item5706cf3b1d:g:NucAAOSws8lhaAtX
For fastening down to concrete I would use Thunderbolts, just ensure you use the correct size of drill bit. They are easy to remove should you want to move it in the future.