DataPersistence is deprecated, use DataStores instead
You'll need to serialize the data for each model and then load it back later

How to use serialization for this?

Because you're using prebuilt assets, you're at an advantage here: You can save 2 properties per model, and you're done.
Requirements:

• Your models are uniquely identifiable, and when placed can be linked back to the asset they were cloned from
• Your models have a PrimaryPart

Saving

Assuming that all of your placed objects are under a single model or are tracked, you may use something like this (Assumes list is an array of placed models, and that 'Player' is predefined)

local DS = game:GetService('DataStoreService'):GetDataStore(tostring(Player.userId));
local stable = {};
for i=1,#list do
stable[i] = {list[i].Name,{list[i]:GetPrimaryPartCFrame():components()}};
end;
DS:SetAsync('Build', stable);

Loading

Working under the same assumptions as saving, but this time assuming that the positions translate to the same place. If you need a solution where they're relative to a specific position, I can provide you with that, but extra work is not my job.
Assumes that your models are in something predefined as ModelsContainer

local DS = game:GetService('DataStoreService'):GetDataStore(tostring(Player.userId));
local stable = DS:GetAsync('Build')
for i=1,#stable do
local nm = ModelsContainer[stable[i][1]]:Clone();
nm.Parent = workspace;
nm.CFrame = CFrame.new(unpack(stable[i][2]))
end;

I hope I helped.