Use a wall anchor and keep the bike as tight to the wall as possible. Keep the chain tight and as short as possible through a frame point and around the wall anchor. If you do it correctly, it should be as difficult to access as possible - even to lock and unlock. Keep an chains to ground anchors off the floor and tight, as that makes bolt croppers more difficult. A loose chain allows the cropper handles to be put on the floor and pressure applied to pop it, a tight chain means the croppers will need to be used with upper body strength alone, like an eighties Bullworker - star of many home video howlers.
Good quality locks can be used to take the brunt of any attack. Abus do some good locks that are great for rear sprocket (discs not acccessible on most trials) - smart ones will notify you if they are activated, the Victory is just a PITA as it just spins - all of it, in all directions. All are grinder and impact resistant. A decent home chain is ideal, 16-22mm is best. Make sure it is hardened or tungsten carbide. Abus D Locks are tungsten carbide and both those and the victory/smart locks can be used with chains, making the chain alarmed. Kovix also do a similar set up with a cable designed as a 'quick' lock but will also work well with a smaller chain.
The essential advice, is be creative - use as many locks as you can be bothered to unlock and DO NOT trust your garage doors - they are torn open in seconds! You can look into reinforcing up and overs, using frame dead bolts to prevent this, but there is olnly so much you can do. Asgard Security Sheds are getting pretty good now and as expandable, as we all knows bikes multiply in the night through no fault of our own.