We have a spare bassinet in our lounge room that my newborn sleeps in during daytime but my 2year old isn’t too interested in her brother and ignores him for the most part
When I would babysit my nephew who was around 1ish, while having a newborn I would just keep the baby in the sling on me or in a bouncer on the sofa next to me and I would let my nephew go near the baby to teach him to be gentle but being weary and keep close eye on the interaction before it escalates, as little kids will get more frustrated easily if you don’t let them near the baby and be more likely to hurt them, but if you take their hand and touch the baby nicely (if they want to touch them) they will soon learn to not be forceful but they will need to be taught to be gentle not that they can’t go near the baby
So my little girl is 2.5 years old and my baby is 3 months. She has a joie swing she stays in during the day which is off the floor, unless she's with me of course. Unfortunately I think the hitting newborn stage is something you csnt always avoid and we had alot of it. She's now understood that we don't do it, took a while she still is heavy handed but kids don't understand gentle or what it will hurt concept. We also have a puppy and it works well for us.
A crib or something high enough they can’t reach
Im not there yet (still pregnant) but will be in the same boat as you with a 22month old. My plan is to have the baby nap: 1. in the pram so i can move him with me where i go, 2. In the sling on me 3. In the bedroom in his cot on his own (with baby monitor) with the door closed. These are my options 😀