The trouble is, that spots you may consider 'likely' are not necessarily the spots that the deer actually use!
You need to look at the areas more closely for indirect sign of deer to establish where they do actually go. Just because an area looks nice to you, it might not to a deer! Deer are generally creatures of habit. Even fallow which seem randomly transient are random, but within a general area and favour specific places. You just need to learn where they are! Try to think like a deer! Deer need three things really;
1. Shelter
2. Food
3. security
These will clearly vary from day to day because of weather, wind direction, land useage, public access, etc for the shelter and security. Food is clearly seasonal.
So consider this
before you head out. Where is a sheltered spot with a source of food that is likely to be undisturbed? How can I get to it without disturbing it?
You are now beginning to think like a deer!
Next you should consider that deer are used to ground based predators. It's a game of 'who sees who' first and they have evolved to be quite good at this! We may better their eyes with our optics, but we cannot begin to compare our ears and noses to theirs which are highly tuned! We therefore should avoid being on the ground as we will often lose the game, although the challenge is clearly fun and what drives many of us! An elevated position suddenly gives you a massive advantage as they are not looking for you up there!
As well as looking for signs of deer impact such as tracks/slots/fewmets/browse lines/fraying/wallows/bark stripping/couches/broken stems/grazed areas/etc... you can also use stealth cameras to good effect. Not only do they let you know what is there, you can also build up a pattern of
when it is there. Before shelling out a load of money on expensive high seats, it is worth getting a small portable one such as a Panther which you can use to test an area. Quite often, you will sit up it and quickly realise that it should actually be somewhere else close by! So move it and try again! Once you've established a good site you can then consider something more permanent. Getting to a fixed point is often the biggest challenge which you elude to in your post. Concealed entry is essential and wind direction is a critical consideration. If you get it right, then you can often shoot deer almost instantly. I recently shot 2 fallow within about 10 seconds of climbing into a tower! I've regularly shot deer using the ladder of a seat as a rest as they are already there on arrival. Doe boxes are also a great aid and can be easily constructed from a few wooden pallets on their sides and some wooden stakes. Make the stakes slightly higher and you can even fit a sloping roof!
I hope my rambling are useful and make some sense? I think to summarise though, you can't just expect the deer to come to you! You need to find them.
Good luck.
MS